dbailey223

tony1970

I have the PMB insert for my '05 and yes it did make a difference. I did this in conjunction with re jetting and free mods. I would re jet for sure if you are going to install one, but you would also have too if you put on a new pipe. As far as a power gain compared to a new pipe it probably is not as much, but it sure is an improvement over the peashooter insert it comes with and it keeps the noise down.

NuckingFuts

installed on my 02' 426 and the gains are great, quiet, and the jetting isnt far from stock. I drilled some extra holes in the small tubing to increase air flow w/o increasing the sound to much. Worked like I wanted too.

Few

FrankTheTank

Finally put it in my bike the last weekend (06WR450F) after dooing all of the free mods a couple of weeks ago. Very noticable difference in overall performance. I haven't rejetted yet but am going to give it a try tonite though. What I noticed was that the roll on was smoother and the mid range bog i was getting went away.

Worth the money - YES

Would I maybe wait and get the end cap with spark arrester - probably should have.

Stinez

I'm using the PMB insert on my 06 wr450f. I like the set-up because it's still within the legal noise limit while giving the motor some air.
IMO The price and the potential noise isn't worth the slight power gain an aftermarket pipe gives because I'm not doing any serious racing.

crooks420

For the money, do the JD kit, Zip-Ty, AIS removal, Uni filter, and the free mods (grey wire, snorkle, throttle screw) and go with a PMB. This worked well on my 05 WR450. When compared to my buddies stock WR450...... well lets just say I rode his for maybe a half mile before I wanted my bike back..... I would guess if you spent more money on a whole exhaust sytem, it could only get better.... But my mods got my bike to where it should be from the factory.... and I am pleased. All I could ask for is a bit more wheel lift when I lightly whack the throttle. Dont get me wrong... it'll come up just fine, but its a tad harder at those tight woods pace.... or is it just me????